Grinding-machine.



No. 677,!27. Pa ltented lune 25, l90l.

J. GILSUN.

1 GRINDING MACHINE.

(Application filed Nov. 6, 1899.)

(No Model.) 2 Sheets-Sheet 2.

UNITED STATES PATENT Orrrcn.

JOHN GILSON, OF PORT W'ASHINGTON, WISCONSIN, ASSIGNOR TO THE GILSONMANUFACTURING COMPANY, OF SAME PLACE.

GRINDING-MACHINE.

SPECIFICATION forming part of Letters Patent No. 677,127, dated June 25,1901.

Application filed November 6,1899. Serial No. 786,035. (No model.)

To to whom it may concern:

Be it known that I, JOHN GILSON, a citizen of the United States, and aresident of Port Washington, in the county of Ozaukee and State ofWVisconsimhave invented certain new and useful Improvements inGrinding-Machines; and I do hereby declare that the following is a full,clear, and exact description thereof.

My invention has for its object to provide simple economical high-speedgrinding-machines of that class especially designed for sharpening knifesections of mower and reaper sickle-bars, but which may be readilyutilized for other grinding operations, said invention consisting incertain pecularities of construction and combination of partshereinafter particularly set forth with reference to the accompanyingdrawings and subsequently claimed.

Figure 1 of the drawings represents a side elevation of my improvedgrinding-machine partly broken and in section; Fig. 2, a partlysectionalfront elevation of a portion of the machine, the view being indicated bylines 2 2 in the preceding figure; Fig. 3, a longitudinal verticalsection of said machine, indicated by lines 3 3 in the succeedingfigure; Fig. 4, a horizontal section of the aforesaid machine, indicatedby lines l 4 in the first figure; Fig. 5, a detail face view of portionsof a sheave and belt constituting parts of the machine; Fig. 6, a detailsectional view illustrating a form of grinding-wheel'employed forgrinding operations other than sharpening of sickle-bar knife-sections,and Fig. 7 a detail face view of another of the belt-sheaves.

Referring by letter to the drawings, A indicates a rectangularcast-metal skeleton base, and shown in rocker-bearing connection withthe same is a sickle-bar clamp, together with means by which it may beheld in tilted position at various angles, this variety of clamp beingold in the art. It is also old in the art to have the knife-rests andsickle-bar abutments of the clamp integral parts of the base, wherebythe latter is made to constitute the lower jaw of the clamp. Now as afeature of my present improvements the lower jaw of the clamp in anyform is provided with a forward longitudinal slotted shank B, having adepressed free end into which the slot extends, and thereby forms avertically-disposed notch, as clearly illustrated in Figs. 1 and 4.Another feature of my improvements consists in providing the upper jawof the clamp with an under side rib b, that extends in a directioncrosswise of the lower jaw-shank. The upper clamp-j aw is also providedwith the usual stilt-lugs and has an aperture in its forward handleportion engaged by a bolt 0, that also engages the slotted and notchedshank B of the lower clamp-jaw, a thumb-nut 0 being run on the bolt tocomplete the clamp. From the foregoing and the showing in Figs. 1 and 4it will be readily understood that I provide for-a forward run andclearance tilt of the upper clamp-jaw when a sickle-bar with itsattachments is to be positioned on the lower jaw of the clamp or removedfrom the same.

In rigid connection with the side members of the base A, at the rearthereof, are parallel standards D, the upper ends of which curvebackward and terminate in bearings for journal-bosses c of a swing-yoke,compris ing an upper cross-piece E and branches F F depending from thesame, said cross-piece being above the journal-bosses and serving asa'handle by which to manipulate the yoke. Bosses d d extend in the samedirection from the lower ends of the branches F F of the swing-yoke. Theboss 01 is loose in an eye at the rear end of a side bar G, constitutingpart of the skeleton-frame carrier that ordinarily has reciprocativemovement longitudinally of the machine under control of the operatormanipulating the aforesaid swing-yoke, such movement being necessarywhen said machine is utilized for grinding knife-sections of asickle-bar, and fitting an angular reduction of said boss is astay-washer e for said frame-bar, a keyf being extended through anaperture in the stud reduction to oppose the washer. The boss dis loosein the elongated hub of a sheave H and an eye in another side bar G ofthe aforesaid carrier.

The elongation of'the sheave-hub isin the of said screw is normallyopposed.

form of a pinion I, in mesh with a spur-wheel J, held to rotate on ajournal-boss of the swingyoke above specified, said spur-wheel beingoperated by a crank Kin one piece or otherwise rigid therewith.

The forward ends of the carrier-frame side bars arein the form of eyes,constituting bearings for flanged journals L L, that have tight fit inthe bore of a grinding device M, such as is commonly employed in avariety of machines organized for sharpening knife-sections ofasickle-bar, the journal L being made to form a sheave H of considerablyless diam eter than the one H aforesaid, these sheaves being in line andhaving a round belt N run thereon. The j ournalLhas ascrew-threaded boreengaged by the screw-threaded end of an arbor in the form of a bolt 0,extending through journal L and the grinding device M, the head of thebolt being in opposition to the latter journal, whereby both journalsare made to clamp said grinding device. The distance between the frontends of side bars of the carrier-frame and the length of the journals LL are such that provision is had for enough side thrust on the part ofsaid journals and. interposed grinding device as will permit automaticadjustment of said grinding device on knife-sections of a sickle-barheld by the clamp aforesaid.

As shown in Fig. 6, another grinding device M in the form of a wheel maybe substituted for the oneM, and to compensate for the difference inface of these two grinding devices a journal L, longer than the one L,is utilized in screw-thread connection with the bolt 0 aforesaid, thecross-piece G of the carrier-frame being notched to afford clearance forsaid substitute grinding device, the latter being for work on parts ofagricultural implements and edge-tools of various kinds forwhich thegrinding device M is not suitable. Instead of grooving the faces of thesheaves H H they are provided with staggered lugs g of such contour asto cause tortuous travel of the belt N and prevent the same fromslipping. As best shown in Fig. 7, each of the staggered sheave-lugs 9may be provided with an inner central rib g to facilitate strain of saidlugs on the belt.

The side bar G of the carrier-frame is pro vided with an outer laterallug h, having a tapped aperture engaged by a screw P, held in adjustedposition by a jam-nut 2' thereon, and projecting forward from theadjacent standard of the machine is a finger Q, havingan inclined upperedge to which the lower end The adjustment of the screw 1? against thefinger Q determines the initial elevation of the grinding device M withrespect to the sickle-bar knife-sections to be ground, and thus thepoints of said knife-sections are saved from harm, while at the sametime unnecessary pull on the tension-spring, hereinafter set forth, isavoided. I

The standard having the finger Q is provided with an inner lugjin theforward path of another outer lateral lug it on the side bar G of thecarrier-frame when the machine is utilized forgrindingsickle-barknife-sections,

whereby the forward travel of said carrierframe and the grinding deviceM is limited, the rearward travel being limited by the carrier-frame lugh abutting said standard. The lug 7c of thecarrier-frame is recessedfrom its under side to fit the standard-lug j, and an engagement ofthese lugs is had to hold said carrier-frame stationary in elevatedposition at times when the grinding device M is utilized. It is obviousthat the same results could be obtained were the finger standardlugjmade with a recess to be engaged by the carrier-frame lug.

A pin m projects inward from the machinestandard that is provided withthe lugj, and suspended from the pin is the tension-spring R, common inthe art to which my improve* ments relate. The lower end of the springis hooked to any one of a series of lugs 11, extending inward from theside bar G of the carrier-frame, according to the tension desired. InFigs. 1 and 3 the carrier-frame is shown on half-stroke, thetension-spring being vertical and exercising its least resistance toload; but as the resistance of said spring increases as saidcarrier-frame proceeds on its stroke in either direction it will beunderstood that the power of the aforesaid spring is better equalized atall times with respect to load.

The relative sizes of the belt-sheaves are such that the speed of thegrinding device is very high in proportion to the power necessary todrive the same, and the machine may be readily taken apart for knockdownshipment or storage and as readily assembled.

Having thus described my invention, what I claim as new, and desire tosecure by Letters Patent, is-

1. A grinding-machine of the species described having the lower jaw ofits clamp provided with a forward shank depressed at its free end andlongitudinally slotted through the depression, the upper jaw of theclamp provided with an under side rib in a direction crosswise of saidshank, a bolt engaging the shank-slot and an aperture in the handleportion of said upper jaw, and a nut run on the bolt.

2. A grinding-machine of the species described having the lower jaw of.its clamp provided with a forward shank depressed at the free end andlongitudinally slotted through the depression, a bolt engaging theshankslot and an aperture in the upper jaw of the clamp, and a nut runon the bolt.

3. A grinding-machine of the species described having a standard thereofprovided intermediate of its extremities with a forwardly-projectingfinger the upper edge of which is inclined, a lateral lug on thereciprocative element of the machine, and a screw in adj ustableconnection with said lug to normally oppose the inclined edge of saidfinger.

I stationary support to be vertical when said 4. A grinding-machine ofthe species de- I reciprocative element is on half-stroke in eitherdirection.

In testimony that I claim the foregoing I have hereunto set my hand, atPort VVashington, in the county of Ozaukee and State of Wisconsin, inthe presence of two Witnesses.

JOHN GILSON.

scribed having the reciprocative carrier element and a standard thereofprovided with lugs, the standard-111g being arranged to come in the pathof the log on the carrier to limit forward travel of said carrier.

5. A grinding-machine of the species described having the spring inconnection with its reciprocative element suspended from a Witnesses:

EDW. BARELMAN, O. A. SEIFERT.

